ABC OF THE STEEL SQUARE 103 



over from the lines, R, R, keeping the heel of 

 the square at the points 3, 3. At the junction 

 of the lines formed by the tongue of the square 

 at will be one point, and 1 will be the other by 

 which the joint line, A, is defined. 



Fig. 67. 



To find the line of juncture for an acute 

 angle, proceed as follows: Fig. 67 represent- 

 two parallel boards or timbers ; 1 the extreme 

 angle, 3, 3 equal distances from the angle 1 and 

 are the points where the heel of the square must 

 rest to form the lines 0, 3; shows the junction 

 of the lines formed by the blade of the square. 

 Draw a line from to 1, and the line, A, formed, 

 is the bevel required. 



It will be seen, by these two examples, that 

 the bevel of a junction at any angle may be 

 obtained by this method. 



